I'd have to say I don't 100% agree.
Had an HR fault on Saturday, classic symptoms, dropped sync as soon as the phone was used. The PQT showed only 1ohm difference between the leg resistance, ie balanced. The JDSU's TDR would show nowt, auto ID, nowt (new firmware loaded this week), and even my trusty ( I agree with you here), tester 301 shows nothing........
The fault was in the poxy three way crimps in the cab, 320m away, why do they insist they are used ? Why would nothing show this up ?
The network has benefited greatly from the money / focus OR have been able to pour into it.
Shame the new higher level management is returning their focus to prod [sad]